deps/protobuf/java/core/src/test/java/com/google/protobuf/SingleFieldBuilderV3Test.java
// Protocol Buffers - Google's data interchange format
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package com.google.protobuf;

import protobuf_unittest.UnittestProto.TestAllTypes;
import protobuf_unittest.UnittestProto.TestAllTypesOrBuilder;

import junit.framework.TestCase;

/**
 * Tests for {@link SingleFieldBuilderV3}. This tests basic functionality.
 * More extensive testing is provided via other tests that exercise the
 * builder.
 *
 * @author upchh@example.com (Jon Perlow)
 */
public class SingleFieldBuilderV3Test extends TestCase {

  public void testBasicUseAndInvalidations() {
    TestUtil.MockBuilderParent mockParent = new TestUtil.MockBuilderParent();
    SingleFieldBuilderV3<TestAllTypes, TestAllTypes.Builder,
        TestAllTypesOrBuilder> builder =
        new SingleFieldBuilderV3<TestAllTypes, TestAllTypes.Builder,
            TestAllTypesOrBuilder>(
            TestAllTypes.getDefaultInstance(),
            mockParent,
            false);
    assertSame(TestAllTypes.getDefaultInstance(), builder.getMessage());
    assertEquals(TestAllTypes.getDefaultInstance(),
        builder.getBuilder().buildPartial());
    assertEquals(0, mockParent.getInvalidationCount());

    builder.getBuilder().setOptionalInt32(10);
    assertEquals(0, mockParent.getInvalidationCount());
    TestAllTypes message = builder.build();
    assertEquals(10, message.getOptionalInt32());

    // Test that we receive invalidations now that build has been called.
    assertEquals(0, mockParent.getInvalidationCount());
    builder.getBuilder().setOptionalInt32(20);
    assertEquals(1, mockParent.getInvalidationCount());

    // Test that we don't keep getting invalidations on every change
    builder.getBuilder().setOptionalInt32(30);
    assertEquals(1, mockParent.getInvalidationCount());

  }

  public void testSetMessage() {
    TestUtil.MockBuilderParent mockParent = new TestUtil.MockBuilderParent();
    SingleFieldBuilderV3<TestAllTypes, TestAllTypes.Builder,
        TestAllTypesOrBuilder> builder =
        new SingleFieldBuilderV3<TestAllTypes, TestAllTypes.Builder,
            TestAllTypesOrBuilder>(
            TestAllTypes.getDefaultInstance(),
            mockParent,
            false);
    builder.setMessage(TestAllTypes.newBuilder().setOptionalInt32(0).build());
    assertEquals(0, builder.getMessage().getOptionalInt32());

    // Update message using the builder
    builder.getBuilder().setOptionalInt32(1);
    assertEquals(0, mockParent.getInvalidationCount());
    assertEquals(1, builder.getBuilder().getOptionalInt32());
    assertEquals(1, builder.getMessage().getOptionalInt32());
    builder.build();
    builder.getBuilder().setOptionalInt32(2);
    assertEquals(2, builder.getBuilder().getOptionalInt32());
    assertEquals(2, builder.getMessage().getOptionalInt32());

    // Make sure message stays cached
    assertSame(builder.getMessage(), builder.getMessage());
  }

  public void testClear() {
    TestUtil.MockBuilderParent mockParent = new TestUtil.MockBuilderParent();
    SingleFieldBuilderV3<TestAllTypes, TestAllTypes.Builder,
        TestAllTypesOrBuilder> builder =
        new SingleFieldBuilderV3<TestAllTypes, TestAllTypes.Builder,
            TestAllTypesOrBuilder>(
            TestAllTypes.getDefaultInstance(),
            mockParent,
            false);
    builder.setMessage(TestAllTypes.newBuilder().setOptionalInt32(0).build());
    assertNotSame(TestAllTypes.getDefaultInstance(), builder.getMessage());
    builder.clear();
    assertSame(TestAllTypes.getDefaultInstance(), builder.getMessage());

    builder.getBuilder().setOptionalInt32(1);
    assertNotSame(TestAllTypes.getDefaultInstance(), builder.getMessage());
    builder.clear();
    assertSame(TestAllTypes.getDefaultInstance(), builder.getMessage());
  }

  public void testMerge() {
    TestUtil.MockBuilderParent mockParent = new TestUtil.MockBuilderParent();
    SingleFieldBuilderV3<TestAllTypes, TestAllTypes.Builder,
        TestAllTypesOrBuilder> builder =
        new SingleFieldBuilderV3<TestAllTypes, TestAllTypes.Builder,
            TestAllTypesOrBuilder>(
            TestAllTypes.getDefaultInstance(),
            mockParent,
            false);

    // Merge into default field.
    builder.mergeFrom(TestAllTypes.getDefaultInstance());
    assertSame(TestAllTypes.getDefaultInstance(), builder.getMessage());

    // Merge into non-default field on existing builder.
    builder.getBuilder().setOptionalInt32(2);
    builder.mergeFrom(TestAllTypes.newBuilder()
        .setOptionalDouble(4.0)
        .buildPartial());
    assertEquals(2, builder.getMessage().getOptionalInt32());
    assertEquals(4.0, builder.getMessage().getOptionalDouble());

    // Merge into non-default field on existing message
    builder.setMessage(TestAllTypes.newBuilder()
        .setOptionalInt32(10)
        .buildPartial());
    builder.mergeFrom(TestAllTypes.newBuilder()
        .setOptionalDouble(5.0)
        .buildPartial());
    assertEquals(10, builder.getMessage().getOptionalInt32());
    assertEquals(5.0, builder.getMessage().getOptionalDouble());
  }
}
